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Not that I am trying to be a wise guy, but my advice would be to get a new piece of hardboard and use gesso. The cost of hardboard is not that much. If you want a smooth surface, sand between coats. Or you can even buy pre-primed panels or clay board. In the end it will make your life easier. Painting is hard enough as it is. Why complicate it further with all that prep work and having to wait for an oil base primer to dry?
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